please help only one question. will mark brainliest if solved​

Answer:

A polymer is any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, which are multiples of simpler chemical units.  Polymers make up many of the materials in living organisms and are the basis of many minerals.

Explanation:

Explanation:

The first man-made polymers were actually modified versions of these natural polymers. Celluloid, the stuff from which silent-movie film was made, was a plastic created from chemically modified cellulose. The first completely synthetic polymer (that is, made by people through chemical synthesis), invented in the early years of the twentieth century, was Bakelite: a plastic made by reacting phenol and formaldehyde under pressure at high temperatures.

# be careful #

Answer:

Lithium

Explanation:

The 3rd (third) element on the periodic table is Lithium. Lithium is a soft, silvery, light alkali metal denoted with the symbol Li.

Answer:

47.01 °C

Explanation:

Q = mcΔt

Mass of water = 2470g

c or specific heat capacity of water = 4.18 J °C g

Q = 5.47 x 10⁵ J, which is expanded 547,000 J

No idea what Δt is, but we do know the water began to boil, and we know that water's boiling point is 100°C, so the final temperature had to be 100°C.

547,000 J = (2470) x (4.18) x (Δt)

Rearrange equation for Δt

(547,000) / (2470 x 4.18) = Δt

Δt = 52.98°C

But we're not done. We're trying to find the INITIAL TEMPERATURE of the water, not the TEMPERATURE CHANGE. We already have the final temperature, which is 100°C, and now we have how much the initial temperature rose by to get to 100°C.

All that we have to do now is 100 - 52.98 = 47.02°C

The initial temperature of the water is 47.02°C

Answer:

Concentration is measured in moles per cubic decimetre: mol dm–3. To find the concentration of a solution, divide the number of moles by the volume in dm3. If the volume is in cm3, divide the volume by 1000 first to convert it into dm3.

Explanation:

Answer:

derived unit. noun. a unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.

Explanation:

Oxygen is participating in non-polar covalent bond(s)

Oxygen forms 2 covalent bond.

This is because oxygen atoms have 6 valence electrons. This means that it has 2 lone pairs and 2 unpaired electrons that are shared in order to achieve octet configuration.

In this chemistry, the 2 lone pairs on the oxygen are not shared with any other atoms. Instead; they are assigned to the oxygen atom. The formal charge on the oxygen atom is zero. Oxygen's atomic number is 8 and is equal to the sum of the number of its valence and inner shell electrons.

Nonpolar covalent bonding is a kind of covalent bond in which the bonding electrons are shared equally between the two atoms.

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Using the Michaelis-Menten equation competitive inhibition, the Inhibition constant, Ki of the inhibitor is 53.4 μM.

The Ki of an inhibitor is known as the inhibition constant.

The inhibition is a competitive inhibition as the Vmax is unchanged but Km changes.

Using the Michaelis-Menten equation for inhibition:

Making Ki subject of the formula:

where:

Solving for Ki:

where

[I] = 26.7 μM

Km = 1.0

Kma = (150% × 1 ) + 1 = 2.5

Ki = 26.7 μM/{(2.5/1) - 1)

Ki = 53.4 μM

Therefore, the Inhibition constant, Ki of the inhibitor is 53.4 μM.

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Answer:

1- Watershed

2- Point

3- Nonpoint

Explanation:

Just did it

Answer:

1. watershed

2. point

3. nonpoint

Explanation:

Hope you could understand.

If you have any query, feel free to ask.

Answer:

It going to be 54

Explanation:

I got it right but I would say it's because the temperature stays the same. So the K value stays the same.

The number of atoms in 1 mg of NaCl = 1 × 10^19 atoms

Atomic mass of Na = 23

Atomic mass of Cl = 35.5

Therefore the molar mass of NaCl = 23 + 35.5 = 58.5g/mol

But 1 mg = 0.001g and 1 mol = 6.022 × 10^ 23

Therefore, If = 58.5g = 6.022 × 10^ 23 atoms

0.001g =X atoms

X atoms = 6.022 × 10^23 × 0.001/58.5

= 0.1 × 10^23 × 10^-³

= 1 × 10^19 atoms

Therefore, the number of atoms in 1 mg of NaCl =1 × 10^19 atoms.

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Answer:

D

Explanation:

it's D because it goes waxing crescent to waxing gibbous

Answer:

Its A

Explanation:

It you look at a wavelength chart, it would show you the rate at which the light travels, from its distance. Which means there has to be two points to calculate it.

The mechanism of chemical reaction is the series of steps

by which chemical reaction follows to for a new substances.

For a new substance to evolve from a chemical reaction, there are some steps that needs to be taken. These steps include:

The study of reaction rate, which is the change in concentration of a reactant or product with time, helps to explain further the mechanism of chemical reaction.

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Answer:

100n

Explanation:

f= 0.05*2000=100 N

Answer:

Explanation:

Element Name - Actinium

Symbol - AC

Electronegativity - 1.1

It is a Rare Silvery- white metal that's highly radio active

Answer:

you can now deduct which one is greater or smaller and by how much.

Explanation:

no of moles= mass/molar mass

1ai) 0.4 = m/ ( 12 + (16*2)

m= 0.4* 44

m= 17.6g

ii) 0.6= m/( 2*1 + 16)

m= 0.6 *18

m= 10.8g

b) 0.135 = m/ ( 2*1 +32 + (16*4)

m= 0.135* 98

m= 13.23g

ii) 0.5= m/ (1+35.5)

m= 0.5*36.5

m= 18.25g

2. Avogadro's Number = 6.02×10²³

1 mol of any element= 6.02×10²³ particles

a) 0.1 mol of H20= (6.02×10²³) * 0.1

= 6.02×10²² molecules

ii) 0.3 mol of CO2= (6.02×10²³) * 0.3

= 1.806 × 10²³ molecules

Ans: 0.3 mol of CO2

bi) 0.25 mol of HCl= (6.02×10²³) * 0.25

= 1.505 × 10²³ molecules

bii) - find the no of moles first:

no of moles= mass/molar mass

n= 3.4g/ 34g →mr of H2S in g=2+32= 34g

n= 0.l mol

- use the Avogadro Number.

0.1 mol of H20= (6.02×10²³) * 0.1

= 6.02×10²² molecules.

biii) here you're given the density, use it to find the mass of acetic acid.

ρ = 1049 g/ml

ρ = m/v, where v=5 ml

1049 = m/ 5

m= ρ*v

m= 1049*5

m= 5245 g

• convert this into moles.

mr of CH3COOH= 12 + 3+ 12+ 16+ 16+ 1

= 60

mr in g = 60g

n= m/mr

n= 5245/ 60

n= 87. 41666...

n= 87.4 moles

•using Avogadro's Number:

87.4 moles of acetic acid=(6.02×10²³)*87.4

= 2.25148* 10²⁵

= 2.25 * 10²⁵ molecules

thus, the ans for this is 5 ml of acetic acid.

If any liquid is flowing in a pipe of cross-section area, then rate of flow of liquid across any cross-section remains constant.

According to the equation of continuity states that if any liquid is flowing in streamline flow in a pipe of non-uniform cross-section area, then rate of flow of liquid across any cross-section remains constant. In the Principle of Continuity of State​, Av = constant.

Where A refers to cross-sectional area and v is the velocity in which the fluid flows. It means

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Answer:

There are 232 calories in the bar

Explanation:

Carbohydrates and protein are both 4 calories per gram, while fat is 9 calories per gram.

[tex]27*4=108\\4*4=16\\12*9=108\\108+108+16=232[/tex]

If the farmer wants the pond to be more sustainable, he has to have a greater diversity of living organisms in the pond.

The term ecosystem means a self supporting unit in which there is an exchange of materials and energy. The ecosystem is expected to be self sustaining.

When the farmer adds young individuals from two species of algae-eating fish to the ponds and plants some reeds around the edge of the pond, if the farmer wants the pond to be more sustainable , he has to have a greater diversity of living organisms in the pond.

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Answer: Having a greater diversity of living organisms in the pond

Explanation:

STAAR, Plato, proof below

Answer: Photosynthesis

Explanation:

The process of photosynthesis is used to help make food for plants. The inputs are sunlight, water (H2O), and carbon dioxide (CO2). Then the outputs are glucose (C6H12O6) which is food, and oxygen (O2) is released.

I hope this helps :)

Answer:

below•

Explanation:

6.1 g total?

I don't really know alot about Chemistry

Answer:

More reactive - Sodium and potassium

Less reactive - Aluminum, Manganese and Zinc

Answer:

Explanation:

Here we need to state two metals that are more reactive than Magnesium and three metals which are less reactive than Magnesium using the Reactivity series .

The Reactivity series goes like ,

K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sb > Pb > H > Cu > Hg > Ag > Au > Pt

So from this we see that , Pottasium (K) , Sodium (Na) and Calcium (Ca) are more reactive than Magnesium and Aluminium (Al) , Zinc (Zn) and Iron (Fe) are less reactive than Magnesium .

So that ,

→ Two more reactive metals= K and Na

→ Three less reactive metals = Al , Zn and Fe

I hope this helps .

The mole fraction of acetone (C₃H₆O) is 0.333

Mole fraction of a substance can be obtained by using the following formula:

Mole fraction = mole / total mole

With the above formula, we can obtain the mole fraction of C₃H₆O as follow:

Mole fraction = mole / total mole

Mole fraction of C₃H₆O = 0.1 / 0.3

Mole fraction of C₃H₆O = 0.333

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Answer:

What is the question? I don't see it.

Considering the definition of empirical formula,  the empirical formula is Cd₁C₂H₃O₂= CdC₂H₃O₂.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

You know that a compound is made up of 168.2 g Cd, 35.96 g C, 4.53 g H, and 47.91 g O.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

Cd: [tex]\frac{168.2 g}{112.4 \frac{g}{mole} } =[/tex] 1.496 moles

C: [tex]\frac{35.96 g}{12 \frac{g}{mole} } =[/tex] 2.997 moles

H: [tex]\frac{4.53 g}{1 \frac{g}{mole} } =[/tex] 4.53 moles

O: [tex]\frac{47.91 g}{16 \frac{g}{mole} } =[/tex] 2.994 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Cd: [tex]\frac{1.496 moles}{1.496 moles } =[/tex] 1

C: [tex]\frac{2.997 moles}{1.496 moles } =[/tex] 2

H: [tex]\frac{4.53 moles}{1.496 moles } =[/tex] 3.02≅ 3

O: [tex]\frac{2.994 moles}{1.496 moles } =[/tex] 2

Therefore the Cd: C: H: O mole ratio is 1: 2: 3: 2.

Finally, the empirical formula is Cd₁C₂H₃O₂= CdC₂H₃O₂.

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